﻿#region License
/* ---------------------------------------------------------------- *
 *
 * This file is part of the API Concepts Framework
 * http://apiconceptsframework.codeplex.com
 *
 * Copyright (C) 2014 eva Kühn, Thomas Scheller, Vienna University of Technology
 * http://www.complang.tuwien.ac.at/eva
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses/
 *
 * ---------------------------------------------------------------- */
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using ApiConceptsFramework.Contract;

namespace ApiConceptsFramework.Concepts.Properties
{
	public class NumberOfClassesInPackage : IMeasurableProperty
	{
		internal const float NumberOfClassesToComplexityFactor = 0.1f; //study says 1, but when using a tutorial the influence is rather limited??
		internal const int NumberOfClassesForSuggestingReduction = 30;

		public float CalculateComplexity(MeasurableTarget target, IDE ide = IDE.VisualStudioOrSimilar)
		{
			// c = numberOfClassesInPackage
			int numberOfClassesInPackage = GetNumberOfClassesInPackage(target.Type);
			return (numberOfClassesInPackage-10) * NumberOfClassesToComplexityFactor;
		}

		public IEnumerable<string> GetSuggestions(MeasurableTarget target, IDE ide = IDE.VisualStudioOrSimilar)
		{
			//if more than 20 classes in package, suggest restructuring
			int numberOfClassesInPackage = GetNumberOfClassesInPackage(target.Type);
			if (numberOfClassesInPackage > 20)
				yield return
					"There is a high number of " + numberOfClassesInPackage + " classes in namespace " + target.Type.Namespace +
					", which may make the class " + target.Type.Name + " hard to find. Consider restructuring/adding additional namespaces.";
		}

		public string CalculationInfo { get; private set; }

		private int GetNumberOfClassesInPackage(Type type)
		{
			return type.Assembly.GetTypes().Count(t => t.Namespace == type.Namespace && t.IsVisible);
		}
	}
}
